Function: accurately measure internal and external threads with threaded blades of different sizes. Material and surface treatment: stainless steel material, chrome-plated treatment, high strength, good elasticity, beautiful and generous. The most important thing is that it is not easy to rust and has a long shelf life. done: sharp jagged edges, digital imprints and easy to read. Easy to use: each end is designed with a hole, you can the tooth gauge from there, you can easily twist the threaded blade. Thick plastic bag protector: each is packed in a thick plastic bag to the asphalt from water and stains. Used to measure the pitch of threads and external threads. Threaded plug gauge, quenched, with strong hardness and magnetic head. It can be adjusted freely through the switch. Easy to use, light and delicate, measurement, simple design, versatile and durable. It is useful to check the tool when cutting threads on a metal lathe. Type: Metric + (52pc): 67 x 20mm / 2.63 x 0.78inch Measuring range: 0.25-6.00 mm / 0.0098inch - 0.23inch 52pcs 60Metric system/English system: 60 metric system: 0,25,0,3,0,35,0,4,0,45,0,5,0,6,0,7,0,75,0,8,0,9,1, 0, 1, 25, 1, 5, 1, 75, 2, 0, 2, 5, 3, 0, 3, 5, 4, 0, 4, 5, 5, 0, 5, 5, 5, 6.0 55 British system: 4G, 4-1/2G, 5G, 6G, 7G, 8G, 9G, 10G, 11G, 12G, 13G, 14G, 16G, 18G, 19G, 20G, 22G, 24G, 28, 25G 30G, 32G , 36G, 40G, 48G, 60G, 62G Colour: silver Material: stainless steel Package Contents: 1 * 52pcs metric and inch integral thread gauge Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.